Replaced HDD, now MacBook Pro won't power on.

Just bought a new HDD, Seagate Momentus 750Gb (link below). Installed it in my MacBook Pro, replacing the old 160Gb drive (also a Seagate Momentus, older version though) and when I tried to boot my laptop back up it won't even power on. I don't hear anything starting up, and the status light on the front doesn't turn on either. Putting the old drive back in and booting up it works perfectly fine, just like it did before swapping drives. The drive is supposed to be compatible with my laptop (MacBook Pro 3,1 Late 2007 15"). The drive is not partitioned or formatted, but this should not affect the laptop from powering up. I have no other computer to try the drive in to see if it is DOA but even if it were it again should not affect the laptop from powering up. Any advice on what could be causing the problem or something that I may have overlooked would be much appreciated.
Thanks, Chris
http://www.seagate.com/ww/v/index.jsp?name=st9750420as-momentus-7200-sata-3gbs-7 50-gb-hd&vgnextoid=25dcb937455b7210VgnVCM1000001a48090aRCRD&locale=en-AU&pf=1

Hi c,
Your options, as I see them:
1. Contact Seagate tech/warranty support and see what they have to say.
2. Get an external enclosure to try the HD in.
3. Find another MBP to try the HD in.

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You may want to try this.
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Start up your MBP while pressing Option (alt)|, Command, P, R until your hear 3 chimes rather than 2 as indicated by apple. This worked for me the first time.
Solution B
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